Thanks for the suggestion.
You inspired me to realize that the basic idea shouldn’t be to find a way to
intersperse two arrays, but to find a way to undo the tagging of template.
so `template` === tag`template`, where tag = (templateObj, …args) =>
untag(templateObj, …args)
If you intend to put the templateObj back together into a string eventually
(which i guess most tagging functions do), this kind of action should be very
common.
Since the target (templateObj) is an array, I think the method should belong to
Array, and it should behave like a join, but instead of joining array items
with a string, it joins with many strings. Maybe something like
Array.prototype.interspersedJoin (much like your String.default):
[1,2,3].interspersedJoin(“a”, “b”) = “1a2b3”
[1,2,3].interspersedJoin(“a”) = “1a23”
[1,2,3].interspersedJoin(“a”,”b”,”c”) = “1a2b3c”
And for the tag function:
function tag(templateObj, …args) {
return templateObj.interspersedJoin(...args);
}
> On Dec 23, 2014, at 8:34 PM, Gary Guo <[email protected]> wrote:
>
>
> > From: [email protected] <mailto:[email protected]>
> > Date: Tue, 23 Dec 2014 14:55:57 +0800
> >
> > Given an array of [1,2,3] and other array of [“a”,”b”], it should return
> > [1,”a”,2,“b”,3]. (probably a lot of edge cases to cover, but just ignore
> > them for now).
>
> I came up with an idea. Symmetric to String.raw, we can have a function that
> represents the default procedure.
>
> ```js
> String.default=(a,...b)=>{
> let ret="";
> for(let i=0;ret+=a[i],i<b.length;ret+=b[i],i++);
> return ret;
> };
> ```
>
> So in semantics, String.default `Template` === `Template`. By introducing
> this, we can define a common procedure between tagged and untagged templates:
> untagged templates are equivalent to the tagged ones with tag String.default.
>
> When implementing our own template functions, we can use:
>
> ```js
> function custom(template, ...substitutions){
> // Perform actions on substitutions or template
> return String.default(template, ...substitutions);
> }
> ```
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